We should not allow mosquitoes to breed in our surroundings because they :

Study the given chart carefully and fill in the blanks $(a)$,$(b)$,and $(c)$:

$S$.No.	Name of the disease	Causative organism	Mode of transmission
$1$. Polio	$(a)$	Infection of virus directly/orally
$2$. $(b)$	Lyssa virus	Virus enters human body with saliva of an infected animal
$3$. Typhoid	Salmonella typhi	$(c)$

What are the different means by which infectious diseases are spread?

Which one of the following is not a bacterial disease?

$(a)$ State the method of transmission of each of the following diseases:
$(i)$ Cholera
$(ii)$ $AIDS$
$(iii)$ Malaria
$(iv)$ Pneumonia
$(b)$ Name the disease a person will get if the pathogen targets the liver of a person.

Write the cause,symptoms,and prevention of $AIDS$.